Condensed Consolidated Statements of Equity - USD ($) $ in Thousands	Deferred Compensation Plan Common Stock [Member]	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings [Member]	Noncontrolling Interests [Member]	Total
Beginning Balances at Dec. 31, 2012		$ 1,230	$ 779,904	$ (6,165)	$ 1,103,188	$ 4,973	$ 1,883,130
Beginning Balances, shares at Dec. 31, 2012		123,019,494
Vesting of restricted stock units (shares)		482,403
Vesting of restricted stock units		$ 5	(5)
Tax withholdings related to net share settlements of restricted stock units		$ (1)	(5,438)				(5,439)
Tax withholdings related to net share settlements of restricted stock units, shares		(152,191)
Equity-based compensation			15,397				15,397
Exercise of stock options and warrants		$ 2	2,462				2,464
Exercise of stock options and warrants, shares		216,781
Excess tax benefit associated with equity-based compensation			3,765				3,765
Cash dividends on common stock					(51,213)		(51,213)
Amounts reclassified into earnings, net of taxes				3,483			3,483
Changes in fair value of cash flow hedges, net of taxes				813			813
Distributions to noncontrolling interests						(198)	(198)
Net income (loss)					195,655	350	196,005
Ending Balances at Dec. 31, 2013		$ 1,236	796,085	(1,869)	1,247,630	5,125	2,048,207
Ending Balances, Shares at Dec. 31, 2013		123,566,487
Vesting of restricted stock units (shares)	10,665	492,695
Vesting of restricted stock units		$ 5	(5)
Tax withholdings related to net share settlements of restricted stock units		$ (1)	(6,813)				(6,814)
Tax withholdings related to net share settlements of restricted stock units, shares		(159,936)
Equity-based compensation			18,446				18,446
Exercise of stock options and warrants		$ 2	3,373				3,375
Exercise of stock options and warrants, shares		241,716
Excess tax benefit associated with equity-based compensation			7,518				7,518
Repurchase of common stock		$ (2)	(7,315)				(7,317)
Repurchase of common stock, shares		(167,100)
Cash dividends on common stock					(58,906)		(58,906)
Amounts reclassified into earnings, net of taxes				2,317			2,317
Changes in fair value of cash flow hedges, net of taxes				(6,041)			(6,041)
Distributions to noncontrolling interests						(371)	(371)
Net income (loss)					232,525	802	233,327
Ending Balances at Dec. 31, 2014		$ 1,240	811,289	(5,593)	1,421,249	5,556	$ 2,233,741
Ending Balances, Shares at Dec. 31, 2014		123,984,527					123,984,527
Vesting of restricted stock units (shares)	14,082	432,165
Vesting of restricted stock units		$ 4	(4)
Tax withholdings related to net share settlements of restricted stock units		$ (1)	(6,446)				$ (6,447)
Tax withholdings related to net share settlements of restricted stock units, shares		(138,611)
Equity-based compensation			20,318				20,318
Exercise of stock options and warrants		$ 1	571				572
Exercise of stock options and warrants, shares		46,781
Excess tax benefit associated with equity-based compensation			2,069				2,069
Repurchase of common stock		$ (20)	(91,145)				(91,165)
Repurchase of common stock, shares		(1,962,989)
Cash dividends on common stock					(65,990)		(65,990)
Amounts reclassified into earnings, net of taxes				5,148			5,148
Changes in fair value of cash flow hedges, net of taxes				(11,726)			(11,726)
Distributions to noncontrolling interests						(42)	(42)
Net income (loss)					(95,764)	1,070	(94,694)
Ending Balances at Dec. 31, 2015		$ 1,224	$ 736,652	$ (12,171)	$ 1,259,495	$ 6,584	$ 1,991,784
Ending Balances, Shares at Dec. 31, 2015		122,375,955					122,375,955